Improvement in steam-generators



" NrTED STATES PATENT OFFICE.

TRUOKSON S.. LA FRANCE, OF'ELMIRA, NEW YORK.

IMPROVEMENT lN STEAM-GENERATORS.

Specification forming part of Letters Patent No. lw. dated October5,1870.

T0 @ZZ w/wm, it m/cty/ concern:

Be it known that I, TEUcKsoN S. LA FRANCE, of Elmira, in the county ofOhemung and State of N ew York, have invented a new and IrnprovedSteam-Generator; and I do hereby declare that the following is a full,clear, and exact descrip tion thereof, which will enable others skilledin the art to make and use the same, reference being had to theaccompanying drawings, forming,` part of this specification, in which-Figure l represents a vertical central section of my improvedsteam-generator. Fig. 2 is a horizontal section of the same, taken onthe plane ofthe line a: w, Fig. 1. Fig. 3 is an inverted plan view ofthe tire-box.

Similar letters ot' reference indicate corre sponding parts. y

My invention relates to steam-generators; and it consists in certainimprovements there# on, which will first be described in connection withall that is necessary to afull understanding thereof, and then clearlyspecified in claims.

A in the drawings represents the outer case or shell of the boiler. B isthe tire-box within the same. lIhe tire-box is cylindrical, and is setup in the lower part of the case A, so as to leave an annularWater-space, a, around it, and a full water-space, b, above it.

From the top plate, c, of the tire-box is suspended a series of pipes, CO, into the fire, the said pipes being closed at their lower ends, andprovided with internal tubes or partitions for circulation. Thesmoke-pipes D D project from the top plate, c, upward into the head d ofthe boiler. The head is sunk or depressed to form a smoke-chamber, e, asshown, and around its vertical side f an annular steam-chamber, g.

Within the smoke-'chamber e is set upa superheating dome or vessel, E,whichA is open By means of the chamber g and dome E, I

obtain considerable superheating-surface and an arrangement forutilizing1 the entire heat of the smoke previous to the escape of thelatter.

Additional circulating-pipes F F may be arranged on the inner sides ofthe tire-chamber.

They communicate at their upper and lower ends with the water space a,as is clearly shown in Fig. 1. I obtain thereby a complete circulationin the lower part of the boiler.

Having thus described my invention, I claim as new and desire to secureby Letters Patent l. The dome .E, chamber g, and pipes h, combined andarranged with water-space b, as specified.

2. The combination of steam-chambers E g and smokechambere,whenrelativelyarranged as and for the purpose described.

3. The tire-space B, water-spaces a b, pipes C, smoke-spaces D e, andsuperheating-spaces E g h, all combined and relatively arranged as andfor the purpose described.

TRUGKSON S. LA FRANCE.

Witnesses:

N. P. FAssEr, JEROME B. WHITE.

